EP2271024B1 - Procédé de synchronisation temporelle d'un système de réseau optique passif, système et dispositif de réseau optique - Google Patents

Procédé de synchronisation temporelle d'un système de réseau optique passif, système et dispositif de réseau optique Download PDF

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EP2271024B1
EP2271024B1 EP09741699.4A EP09741699A EP2271024B1 EP 2271024 B1 EP2271024 B1 EP 2271024B1 EP 09741699 A EP09741699 A EP 09741699A EP 2271024 B1 EP2271024 B1 EP 2271024B1
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Prior art keywords
frame
packet
time
clock
time stamp
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German (de)
English (en)
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EP2271024A1 (fr
EP2271024A4 (fr
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Ruobin Zheng
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
    • H04J3/0697—Synchronisation in a packet node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
    • H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0066—Provisions for optical burst or packet networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0088—Signalling aspects

Definitions

  • the present invention relates to the field of optical communications, and in particular, to an optical network device, a point-to-multipoint optical communications system, and a method for synchronizing time of a passive optical network.
  • a Passive Optical Network includes an Optical Distribution Network (ODN), which contains no electronic device or electronic power source and is entirely composed of passive devices such as optical splitters.
  • ODN Optical Distribution Network
  • a PON includes an Optical Line Terminal (OLT) installed in a central office and a batch of Optical Network Units (ONUs) installed at the customer premise.
  • OLT Optical Line Terminal
  • ONUs Optical Network Units
  • Three PON technologies are provided, Asynchronous Transfer Mode Passive Optical Network (APON), Ethernet Passive Optical Network (EPON) and Gigabit Passive Optical Network (GPON).
  • APON Asynchronous Transfer Mode Passive Optical Network
  • EPON Ethernet Passive Optical Network
  • GPON Gigabit Passive Optical Network
  • EPON and GPON also evolve to the next generation PON (xPON).
  • GTC GPON Transmission Convergence
  • MAC PON Media Access Control
  • a second layer is the MAC layer.
  • the MAC layer is a GTC layer, which includes two sub-layers:
  • the TC adapter sub-layer is responsible for fragmenting service data received from an Asynchronous Transfer Mode (ATM) client into ATM cells and fragmenting service data received from a GPON Encapsulation Method (GEM) client into GEM data blocks; the TC adapter sub-layer is also responsible for assembling ATM cells or GEM data blocks in a GTC frame to appropriate service data.
  • ATM Asynchronous Transfer Mode
  • GEM GPON Encapsulation Method
  • the GTC framing sub-layer is responsible for assembling GTC TC frames. Specifically, the GTC framing sub-layer adds a GTC TC frame header before an ATM cell or a GEM data block according to control information of Physical Layer Operation, Administration and Maintenance (PLOAM) to create a complete GTC TC frame and send the frame to the GPM layer; the GTC framing sub-layer is also responsible for removing frame header information from a GTC TC frame received from the GPM layer and sending the frame with the frame header information removed to the TC adapter sub-layer for processing.
  • PLOAM Physical Layer Operation, Administration and Maintenance
  • the GPON also has a third layer, which includes the ATM client, GEM client and the following units:
  • IEEE 1588 is the Precision Time Protocol (PTP) of a system for network measurement and control, and implements synchronization of the slave clock of an ONT (client device) with the master clock of the main control device by sending/receiving clock packets.
  • PTP Precision Time Protocol
  • the principle of the IEEE 1588 PTP protocol is described as follows: Based on the most precise time when the synchronization packets are sent and received, each slave clock exchanges synchronization packets with the master clock to achieve synchronization with the master clock.
  • the synchronization process includes two stages: offset measurement stage and delay measurement stage.
  • FIG. 2A illustrates the offset measurement stage where the master clock broadcasts two messages to all nodes on the network:
  • the “delay” above means the transmission delay between the master clock and the slave clock and will be measured in the following measurement stage. At the current stage, the delay is unknown and assumed to be 0.
  • Adjust Time Ts ⁇ Offset
  • the second stage is the delay measurement stage as shown in FIG. 2B .
  • the delay measurement stage measures the delay caused by network transmission.
  • the measurement is achieved through exchange of the following messages between the master clock and the slave clock:
  • the slave clock sends the Delay Request at Ts3 130.75s after receiving the sync message.
  • the master clock sends the Delay Response to the slave clock after receiving the Delay Request and marks the precise receiving time Tm3 131.25s in the Delay Response.
  • the slave clock can calculate the accurate network delay.
  • IEEE 802.3 defines the basic structure of an Ethernet frame, including: preamble, Start Frame Delimiter (SFD), destination address, source address, length field, data field, and frame check sequence.
  • SFD Start Frame Delimiter
  • the preamble consists of 8 bits of alternated 1s and 0s.
  • the SFD includes 8 bits where the first 6 bits are alternated 1s and 0s and the last 2 bits are "1, 1" indicating the start of the frame to the receiver. Following the two bits are the actual fields of the frame.
  • all clock packets defined by IEEE 1588/1588v2 are transmitted in the form of IP multicast packets.
  • the packet time stamp generating point for determining the time a clock packet is transmitted or received is located at the last bit of the SFD.
  • each Ethernet frame is mapped into a GEM frame.
  • the GEM frame does not include the preamble and SFD, and the destination address, source address, length field, data field, and frame check sequence field of the Ethernet frame are directly mapped into the GEM payload for transmission.
  • the GEM frame is automatically encapsulated with the GEM frame header which includes four parts: Payload Length Indicator (PLI, 12 bits), Port ID (12 bits), Payload Type Indicator (PTI, 3 bits), and Header Error Control (HEC, 13 bits).
  • the document XP 010854276 “Software and Hardware Prototypes of the IEEE 1588 Precision Time Protocol on Wireless LAN” describes implementation of two IEEE 1588 prototypes for Wireless LAN (WLAN).
  • a master clock sends a synchronization message once in every two seconds in a default configuration.
  • the message contains information about the clock and an estimated timestamp tm1 of the message transmission time.
  • the clock information contains the identification and the accuracy of the master clock.
  • a slave clock receives the sync message, it stores timestamp ts of the reception time (See Figure 2 and III. IEEE1588 OVERVIEW, paragraph 3).
  • Both client clocks use the timestamps for calculating how the local clock has to be adjusted to achieve the synchronization with the master clock (See IV. PROTOTYPE IMPLEMENTATIONS, paragraph 3).
  • embodiments of the present invention provide an optical network device and a method for synchronizing time of a PON master clock, and this achieves time synchronization in the network.
  • a method for synchronizing time of a PON master clock includes:
  • An optical network device includes:
  • a method for synchronizing time of a PON slave clock includes:
  • An optical network device includes:
  • embodiments of the present invention provide a point-to-multipoint optical communications system, which is able to determine the time a clock message is sent and/or received on the master/slave clock side, and this achieves time synchronization in the network.
  • a point-to-multipoint optical communications system includes an OLT and at least one ONU.
  • the OLT includes:
  • the optical network device, point-to-multipoint optical communications system, and method for synchronizing time of a PON the time a clock packet is sent and/or received on the master/slave clock side is acquired based on the packet time stamp generating point of the lower layer transmission frame, and therefore, the present invention enables multiple encapsulation modes of clock packet over the PON protocol transmission frame, for example, the application of IEEE 1588 in "Ethernet over GEM" mode.
  • time is synchronized in the network.
  • an embodiment of the present invention provides a method for synchronizing time at a master clock side.
  • a method for synchronizing time at a master clock side includes the following steps:
  • the first clock packet may be a sync message or a Delay Response message.
  • the second clock packet is a follow-up message.
  • the time a clock packet is sent is first acquired at the packet time stamp generating point, which is determined according to the lower layer transmission frame. Therefore, the method enables multiple encapsulation modes of clock packet over the PON protocol transmission frame, for example, the application of IEEE 1588 in case of Ethernet over GEM. Thus, time is synchronized in the network.
  • the step of acquiring the time at the packet time stamp generating point that matches the frame data of the first downstream frame at the PON MAC layer, regarding the acquired time as the time the first clock packet is sent includes: regarding the last bit of the physical synchronization (Psync) field in the frame header of the GTC TC frame of the first downstream frame at the GTC framing sub-layer as the packet time stamp generating point.
  • the downstream frame structure of the GTC TC frame includes a frame header and a payload.
  • Physical Control Block downstream (PCBd) is the downstream frame header of the GTC TC frame.
  • the packet time stamp generating point is located at the last bit of the Psync field in the GTC TC frame header.
  • the step of acquiring the time at the packet time stamp generating point that matches the frame data of the first downstream frame at the PON MAC layer and regarding the acquired time as the time the first clock packet is sent includes: regarding the last bit of the HEC field in the frame header of the GEM frame of the first downstream frame at the TC adapter sub-layer as the packet time stamp generating point.
  • the GEM frame includes a frame header and a payload.
  • the packet time stamp generating point is determined according to the GEM frame header. For example, the packet time stamp generating point is located at the last bit of the HEC field in the GEM frame header.
  • the step of acquiring the time at the packet time stamp generating point that matches the frame data of the first downstream frame at the PON MAC layer and regarding the acquired time as the time the first clock packet is sent includes: determining the packet time stamp generating point according to the sum of the start time received by the ONU, the response time of the ONU, and the Equal Delay (EqD) of the ONU.
  • the above basis for determining the packet time stamp generating point may be included in the first downstream frame or needs be added to the first downstream frame.
  • the OLT sends a bandwidth map (BWmap) message to the ONU.
  • the BWmap message is used to allocate for each ONU a transmission interval that indicates the ONU to transmit upstream data therein.
  • the StartTime (Sstart) field in the BWmap message includes a time indicator. As shown in FIG. 8 and FIG. 9 , the packet time stamp generating point is determined according to the sum of the start time indicated by the Sstart field in the BWmap message received by the ONU, the response time of the ONU, and the EqD.
  • the response time of the ONU is a performance index of the ONU and is dependent on the hardware configuration of the ONU.
  • the EqD is dependent on the network delay.
  • a method for synchronizing time at a master clock side includes the following steps:
  • the first clock packet may be a sync message or a Delay Response message.
  • the third clock packet may be a Delay Request message.
  • the fourth clock packet is a Delay Response message.
  • the step of acquiring the time at the packet time stamp generating point according to the frame data of the third upstream frame at the PON MAC layer and regarding the acquired time as the time the third clock packet is received includes: regarding the last bit of the Delimiter field in the frame header of the GTC TC frame of the third upstream frame at the GTC framing sub-layer as the packet time stamp generating point.
  • the GTC TC frame includes a frame header and a payload.
  • the packet time stamp generating point is located at the last bit of the Delimiter field in the GTC TC frame.
  • the step of acquiring the time at the packet time stamp generating point according to the frame data of the third upstream frame at the PON MAC layer and regarding the acquired time as the time the third clock packet is received includes: regarding the last bit of the HEC field in the frame header of the GEM frame of the third upstream frame at the TC adapter sub-layer as the packet time stamp generating point, as shown in FIG. 7 .
  • the step of acquiring the time at the packet time stamp generating point according to the frame data of the third upstream frame at the PON MAC layer and regarding the acquired time as the time the third clock packet is received includes: regarding the last bit of the HEC field in the frame header of the GEM frame of the third upstream frame at the TC adapter sub-layer as the packet time stamp generating point.
  • the GTC TC frame includes a frame header and a payload.
  • the Physical Layer Overhead upstream (PLOu) is the upstream frame header of the GTC TC frame.
  • the payload is the upstream frame payload of the GTC TC frame.
  • the last bit of the PLOu in the GTC TC frame header is regarded as the packet time stamp generating point.
  • the first, second, third, and fourth clock packets are carried over Ethernet protocols such as ETH, Internet Protocol (IP), and User Datagram Protocol (UDP). Or, the first, second, third, and fourth clock packets are carried in IEEE 1588/1588v2 over GEM mode; or the first, second, third, and fourth clock packets are carried in PLOAM messages; or the first, second, third, and fourth clock packets are carried in OMCI messages.
  • Ethernet protocols such as ETH, Internet Protocol (IP), and User Datagram Protocol (UDP).
  • IP Internet Protocol
  • UDP User Datagram Protocol
  • the PTI in the GEM frame header may indicate that the frame includes an internal extended field
  • the PTI in the extended field indicates that the service type of the payload is IEEE 1588/1588v2 clock packet.
  • the PTI code when the PTI code is 110, it indicates that an internal GEM frame extended field is carried.
  • FIG. 12 illustrates the structure of a GEM frame when the PTI code is 110.
  • PTI Code Function 000-101 Same as in the prior art, indicates whether the GEM frame is the last section in case of sectional processing or whether congestion occurs. 110 Indicates that an internal GEM frame extended field is carried.
  • an embodiment of the present invention provides a method for synchronizing time of a slave clock.
  • the method for synchronizing time at a slave clock side includes:
  • the first clock packet may be a sync message or a Delay Response message.
  • the second clock packet is a follow-up message.
  • a packet time stamp generating point is first determined based on the lower layer and then the time a clock packet is sent and/or received on the slave clock side is determined according to the packet time stamp generating point. Therefore, the method enables multiple encapsulation modes of clock packet based on the PON protocol transmission frame, for example, the application of IEEE 1588 in case of Ethernet over GEM mode. Thus, time is synchronized in the network.
  • the step of acquiring the time at the packet time stamp generating point according to the frame data of the first downstream frame at the PON MAC layer and regarding the acquired time as the time the ONU receives the first clock packet includes: regarding the last bit of the Psync field in the frame header of the GTC TC frame of the first downstream frame at the GTC framing sub-layer as the packet time stamp generating point, as shown in FIG. 6 .
  • the step of acquiring the time at the packet time stamp generating point according to the frame data of the first downstream frame at the PON MAC layer and regarding the acquired time as the time the ONU receives the first clock packet includes: regarding the last bit of the HEC field in the frame header of the GEM frame of the first downstream frame at the TC adapter sub-layer as the packet time stamp generating point, as shown in FIG. 7 .
  • the step of acquiring the time at the packet time stamp generating point according to the frame data of the first downstream frame at the PON MAC layer and regarding the acquired time as the time the ONU receives the first clock packet includes: determining the packet time stamp generating point according to the sum of the start time received by the ONU, the response time of the ONU, and the EqD of the ONU, as shown in FIG. 8 and FIG. 9 .
  • a method for synchronizing time at a slave clock side in an embodiment of the present invention includes:
  • the step of acquiring the time at the packet time stamp generating point according to the frame data of the third upstream frame at the PON MAC layer and regarding the acquired time as the time the third clock packet is sent includes: regarding the last bit of the Delimiter field in the frame header of the GTC TC frame of the third upstream frame at the GTC framing sub-layer as the packet time stamp generating point, as shown in FIG. 11 .
  • the step of acquiring the time at the packet time stamp generating point according to the frame data of the third upstream frame at the PON MAC layer and regarding the acquired time as the time the third clock packet is sent includes: regarding the last bit of the HEC field in the frame header of the GEM frame of the third upstream frame at the TC adapter sub-layer as the packet time stamp generating point, as shown in FIG. 7 .
  • the step of acquiring the time at the packet time stamp generating point according to the frame data of the third upstream frame at the PON MAC layer and regarding the acquired time as the time the third clock packet is sent includes: regarding the last bit of the PLOu field in the frame header of the GTC TC frame of the third upstream frame at the GTC framing sub-layer as the packet time stamp generating point, as shown in FIG. 12 .
  • the packet time stamp generating point is determined at the lower layer (GTC framing sub-layer or TC adapter sub-layer) of the PON and thus the precision and accuracy of the generated time stamp are improved.
  • the first, second, third, and fourth clock packets are carried over an Ethernet protocol; or in IEEE 1588/1588v2 over GEM mode; or in PLOAM messages; or in OMCI messages.
  • the first, second, third, and fourth clock packets are received when the ONU is in the Working state or Ranging state.
  • the third clock packet is sent when the ONU is in the Working state or Ranging state.
  • the clock packets are sent and/or received when the ONU is in the Working state; or as shown in FIG. 9 , the clock packets are sent and/or received when the ONU is in the Ranging state.
  • the clock packets are not sent when the ONU is in the Serial Number state to avoid a great error in time synchronization caused by the random delay.
  • Another embodiment of the present invention provides an optical network device on the master clock side, namely, an OLT.
  • the optical network device on the master clock side includes:
  • the optical network device on the master clock side monitors the packet time stamp generating point based on the lower layer and acquires the time the clock packet is sent on the master clock side at the packet time stamp generating point. Therefore, the optical network device on the master clock side is able to support IEEE 1588/188v2 time synchronization in Ethernet over GEM mode and thus realizes time synchronization in the network.
  • the first monitoring unit is also configured to:
  • the sending unit is further configured to send a fourth clock packet of the OLT, where the fourth clock packet carries the time stamp when the OLT receives the third clock packet.
  • the second monitoring unit is also configured to:
  • the optical network device on the master clock side determines the time stamp generating point based on the lower layer (GTC framing sub-layer or TC adapter layer) of the PON, and thus the precision and accuracy of the generated time stamp are improved.
  • an embodiment of the present invention provides an optical network device on the slave clock side, namely, an ONU.
  • the optical network device on the slave clock side includes:
  • the first monitoring unit is also configured to:
  • the optical network device on the slave clock side further includes:
  • the receiving unit is further configured to receive from the OLT a fourth clock packet carried in a fourth downstream frame, where the fourth clock packet carries the time stamp when the OLT receives the third clock packet.
  • the second monitoring unit is further configured to:
  • the optical network device on the slave clock side monitors the packet time stamp generating point based on the lower layer and acquires the time a clock packet is received on the slave clock side at the packet time stamp generating point. Therefore, the optical network device on the slave clock side supports multiple encapsulation modes of clock packet over the PON protocol transmission frame, for example, the application of IEEE 1588 in case of Ethernet over GEM. Thus, time is synchronized in the network.
  • the packet time stamp generating point is determined at the lower layer (GTC framing sub-layer or TC adapter sub-layer) of the PON and thus the precision and accuracy of the generated time stamp are improved.
  • An embodiment of the present invention provides a point-to-multipoint optical communications system.
  • the point-to-multipoint optical communications system includes an OLT and at least one ONU coupled to the OLT.
  • the OLT includes:
  • the ONU includes:
  • the master clock synchronization processing module is further configured to receive a third clock packet and send a fourth clock packet, where the fourth clock packet carries the time stamp when the OLT receives the third clock packet.
  • the master clock packet time stamp generating module is further configured to acquire the time the OLT receives the third clock packet according to the frame data of the third clock packet at the PON MAC layer.
  • the slave clock synchronization processing module is further configured to send the third clock packet; receive from the OLT the fourth clock packet which carries the time stamp when the OLT receives the third clock packet; and correct the time of the ONU according to the difference between the time the ONU sends the third clock packet and the time the OLT receives the third clock packet.
  • the slave clock packet time stamp generating module is further configured to acquire the time the ONU sends the third clock packet according to the frame data of the third clock packet at the PON MAC layer.
  • the optical communications system monitors the packet time stamp generating point based on the lower layer and then determines the time a clock packet is sent and received on the master clock side according to the packet time stamp generating point. Therefore, the optical communications system supports multiple encapsulation modes of clock packet over the PON protocol transmission frame, for example, the application of IEEE 1588 in case of Ethernet over GEM mode. Thus, time is synchronized in the network.
  • the packet time stamp generating point is determined at the lower layer (GTC framing sub-layer or TC adapter sub-layer) of the PON and thus the precision and accuracy of the generated time stamp are improved.
  • optical communications system in the embodiment of the present invention is described hereinafter.
  • FIG. 21 illustrates a first application of the optical communications system according to the embodiment of the present invention, where the first, second, third, and fourth clock packets are carried over an Ethernet protocol.
  • the OLT includes a master clock packet time stamp generating module, a master clock synchronization processing module, an OLT GPM sub-layer processing module, an OLT GTC framing sub-layer processing module, an OLT TC adapter sub-layer processing module, and an OLT network protocol stack processing module.
  • the master clock packet time stamp generating module is configured to determine the position of the master clock packet time stamp generating point and generate time stamp information according to the GTC TC frame header at the GTC framing sub-layer.
  • the master clock synchronization processing module is configured to complete IEEE 1588 protocol processing and exchange clock packets with the OLT to determine the time a clock packet is sent or received according to the time stamp.
  • the network protocol stack processing module is configured to process the protocol stack carrying the clock packets.
  • the protocol stack may be ETH, IP or UDP.
  • the ONU includes a slave clock packet time stamp generating module, a slave clock synchronization processing module, an ONU GPM sub-layer processing module, an ONU GTC framing sub-layer processing module, an ONU TC adapter sub-layer processing module, and an ONU network protocol stack processing module.
  • the slave clock packet time stamp generating module is configured to determine the position of the slave clock packet time stamp generating point and generate time stamp information according to the GTC TC frame header at the GTC framing sub-layer.
  • the slave clock synchronization processing module is configured to complete IEEE 1588 protocol processing and exchange clock packets with the OLT to determine the time a clock packet is sent and received according to the time stamp.
  • the ONU network protocol stack processing module is configured to process the protocol stack carrying the clock packets.
  • the protocol stack may be ETH, IP or UDP.
  • FIG. 22 illustrates a second application of the optical communications system according to the embodiment of the present invention, where the first, second, third, and fourth clock packets are carried over an Ethernet protocol.
  • FIG. 22 differs from FIG. 21 in that: on the master clock side, the master clock packet time stamp generating module is configured to determine the master clock packet time stamp generating point according to the GEM frame header at the TC adapter sub-layer; on the slave clock side, the slave clock packet time stamp generating module is configured to determine the slave clock packet time stamp generating point according to the GEM frame header at the TC adapter sub-layer.
  • FIG. 23 illustrates a third application of the optical communications system according to the embodiment of the present invention.
  • the first, second, third, and fourth clock packet are carried in IEEE 1588/1588v2 over GEM mode.
  • the OLT includes a master clock packet time stamp generating module, a master clock synchronization processing module, an OLT GPM sub-layer processing module, an OLT GTC framing sub-layer processing module, and an OLT TC adapter sub-layer processing module.
  • the master clock packet time stamp generating module is configured to determine the position of the master clock packet time stamp generating point and generate time stamp information according to the GTC TC frame header at the GTC framing sub-layer.
  • the ONU includes a slave clock packet time stamp generating module, a slave clock synchronization processing module, an ONU GPM sub-layer processing module, an ONU GTC framing sub-layer processing module, and an ONU TC adapter sub-layer processing module.
  • the slave clock packet time stamp generating module is configured to determine the position of the slave clock packet time stamp generating point and generate time stamp information according to the GTC TC frame header at the GTC framing sub-layer.
  • FIG. 24 illustrates a fourth application of the optical communications system according to the embodiment of the present invention, where the first, second, third, and fourth clock packets are carried in IEEE 1588/1588v2 over GEM mode.
  • FIG. 24 differs from FIG. 23 in that: on the master clock side, the master clock packet time stamp generating module is configured to determine the master clock packet time stamp generating point according to the GEM frame header at the TC adapter sub-layer; on the slave clock side, the slave clock packet time stamp generating module is configured to determine the slave clock packet time stamp generating point according to the GEM frame header at the TC adapter sub-layer.
  • FIG. 25 illustrates a fifth application of the optical communications system according to the embodiment of the present invention, where the clock packets are carried in PLOAM messages.
  • the OLT includes a master clock packet time stamp generating module, a master clock synchronization processing module, an OLT PLOAM processing module, an OLT GPM sub-layer processing module, and an OLT GTC framing sub-layer processing module.
  • the master clock packet time stamp generating module is configured to determine the position of the master clock packet time stamp generating point and generate time stamp information according to the GTC TC frame header at the GTC framing sub-layer.
  • the ONU On the slave clock side, the ONU includes a slave clock packet time stamp generating module, a slave clock synchronization processing module, an ONU PLOAM processing module, an ONU GPM sub-layer processing module, and an ONU GTC framing sub-layer processing module.
  • the slave clock packet time stamp generating module is configured to determine the position of the slave clock packet time stamp generating point and generate time stamp information according to the GTC TC frame header at the GTC framing sub-layer.
  • FIG. 26 illustrates a sixth application of the optical communications system according to the embodiment of the present invention, where the clock packets are carried in PLOAM messages.
  • FIG. 26 is different from FIG. 25 in that: On the master clock side, the master clock packet time stamp generating module is configured to determine the master clock packet time stamp generating point according to the GEM frame header at the TC adapter sub-layer; on the slave clock side, the slave clock packet time stamp generating module is configured to determine the slave clock packet time stamp generating point according to the GEM frame header at the TC adapter sub-layer.
  • FIG. 27 illustrates a seventh application of the optical communications system according to the embodiment of the present invention, where the clock packets are carried in OMCI messages.
  • the OLT includes a master clock packet time stamp generating module, a master clock synchronization processing module, an OLT GPM sub-layer processing module, an OLT GTC framing sub-layer processing module, an OLT TC adapter sub-layer processing module, and an OLT OMCI adapter sub-layer processing module.
  • the master clock packet time stamp generating module is configured to determine the position of the master clock packet time stamp generating point and generate time stamp information according to the GTC TC frame header at the GTC framing sub-layer.
  • FIG. 28 illustrates an eighth application of the optical communications system according to the embodiment of the present invention, where the clock packets are carried in OMCI messages.
  • FIG. 28 differs from FIG. 27 in that: At the master clock side, the master clock packet time stamp generating module is configured to determine the master clock packet time stamp generating point according to the GEM frame header at the TC adapter sub-layer; on the slave clock side, the slave clock packet time stamp generating module is configured to determine the slave clock packet time stamp generating point according to the GEM frame header at the TC adapter sub-layer.
  • synchronization method optical network device, and optical communications system according to the embodiments of the present invention are applicable not only to GPON systems but also to other xPON systems.
  • the present invention may be implemented by hardware only or by software and necessary universal hardware. However, in most cases, software and necessary universal hardware are preferred. Based on such understandings, all or part of the technical solution under the present invention that makes contributions to the prior art may be essentially embodied in the form of a software product.
  • the software product may be stored in a storage medium.
  • the software product includes a number of instructions that enable a computer device (mobile phone, personal computer, server, or network device) to execute the methods provided in the embodiments of the present invention.

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Claims (15)

  1. Procédé de synchronisation temporelle d'un côté horloge maîtresse dans un réseau optique passif, dit PON, comprenant les étapes consistant à :
    envoyer une première trame sens descendant sur la base d'un protocole PON, la première trame sens descendant acheminant un premier paquet d'horloge ;
    acquérir un temps en un point de génération d'estampille temporelle de paquet qui correspond à des données de trame de la première trame sens descendant au niveau d'une couche de commande d'accès au support, dite MAC, de PON, une règle de correspondance permettant de mettre en correspondance le point de génération d'estampille temporelle de paquet étant prédéfinie d'un côté horloge maîtresse ; le point de génération d'estampille temporelle de paquet se situant au niveau du dernier bit d'un champ de synchronisation physique, dite Psync, dans l'en-tête de trame d'une trame TC de couche de convergence de transmission de PON gigabit, dite GTC, ou au niveau du dernier bit du champ de contrôle d'erreurs dans l'en-tête, dit HEC, dans l'entête de trame d'une trame de méthode d'encapsulation GPON, dite GEM, de la première trame sens descendant au niveau d'une sous-couche d'adaptation TC ;
    considérer le temps acquis comme le temps auquel le premier paquet d'horloge est envoyé ; et
    envoyer une deuxième trame sens descendant sur la base du protocole PON, la deuxième trame sens descendant acheminant un deuxième paquet d'horloge qui achemine le temps auquel le premier paquet d'horloge est envoyé.
  2. Procédé selon la revendication 1, comprenant en outre les étapes consistant à :
    recevoir une troisième trame sens montant sur la base du protocole PON, la troisième trame sens montant acheminant un temps d'acquisition d'un troisième paquet d'horloge en un point de génération d'estampille temporelle de paquet qui correspond à des données de trame de la troisième trame sens montant au niveau de la couche MAC PON ;
    considérer le temps acquis comme le temps auquel le troisième paquet d'horloge est reçu ; et
    envoyer une quatrième trame sens descendant dans le protocole PON, la quatrième trame sens descendant acheminant un quatrième paquet d'horloge qui achemine le temps auquel le troisième paquet d'horloge est reçu.
  3. Procédé selon la revendication 2, dans lequel la règle permettant de mettre en correspondance des points de génération d'estampille temporelle de paquet consiste à :
    considérer le dernier bit du champ délimiteur dans l'en-tête de trame d'une trame TC GTC de la troisième trame sens montant au niveau de la sous-couche de verrouillage des trames GTC comme le point de génération d'estampille temporelle de paquet ; ou
    considérer le dernier bit du champ HEC dans l'en-tête de trame d'une trame GEM de la troisième trame sens montant au niveau de la sous-couche d'adaptation TC comme le point de génération d'estampille temporelle de paquet ; ou
    considérer le dernier bit du champ de surdébit de couche physique sens montant, dit PLOu, dans l'en-tête de trame d'une trame TC GTC de la troisième trame sens montant au niveau de la sous-couche de verrouillage des trames GTC comme le point de génération d'estampille temporelle de paquet.
  4. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel :
    les premier, deuxième, troisième et quatrième paquets d'horloge sont acheminés dans des messages d'exploitation, d'administration et de maintenance de couche physique, dites PLOAM ; ou
    les premier, deuxième, troisième et quatrième paquets d'horloge sont acheminés dans des messages d'interface de gestion et de commande d'ONU, dite OMCI.
  5. Procédé de synchronisation temporelle d'un côté horloge asservie dans un réseau optique passif, dit PON, comprenant les étapes consistant à :
    recevoir une première trame sens descendant sur la base d'un protocole PON, la première trame sens descendant acheminant un premier paquet d'horloge ;
    acquérir un temps en un point de génération d'estampille temporelle de paquet qui correspond à des données de trame de la première trame sens descendant au niveau d'une couche de commande d'accès au support, dite MAC, de PON, une règle de correspondance permettant de mettre en correspondance des points de génération d'estampille temporelle de paquet étant prédéfinie du côté horloge asservie ; le point de génération d'estampille temporelle de paquet se situant au niveau du dernier bit d'un champ de synchronisation physique, dite Psync, dans l'en-tête de trame d'une trame TC de couche de convergence de transmission de PON gigabit, dite GTC, ou au niveau du dernier bit du champ de contrôle d'erreurs dans l'en-tête, dit HEC, dans l'entête de trame d'une trame de méthode d'encapsulation de PON gigabit, dite GEM, de la première trame sens descendant au niveau d'une sous-couche d'adaptation TC ;
    considérer une deuxième trame sens descendant sur la base du protocole PON, la deuxième trame sens descendant acheminant un deuxième paquet d'horloge qui achemine le temps auquel le premier paquet d'horloge est envoyé ; et
    ajuster un temps local en fonction d'une différence entre le temps auquel le premier paquet d'horloge est envoyé et le temps auquel le premier paquet d'horloge est reçu.
  6. Procédé selon la revendication 5, comprenant en outre les étapes consistant à :
    envoyer une troisième trame sens montant dans le protocole PON, la troisième trame sens montant acheminant un troisième paquet d'horloge ;
    acquérir un temps en un point de génération d'estampille temporelle de paquet qui correspond à des données de trame de la troisième trame sens montant au niveau de la couche MAC PON, et considérer le temps acquis comme le temps auquel le troisième paquet d'horloge est envoyé ;
    recevoir une quatrième trame sens descendant sur la base du protocole PON, la quatrième trame sens descendant acheminant un quatrième paquet d'horloge qui achemine le temps auquel le troisième paquet d'horloge est reçu ; et
    corriger le temps local en fonction d'une différence entre le temps auquel le troisième paquet d'horloge est envoyé et le temps auquel le troisième paquet d'horloge est reçu.
  7. Procédé selon la revendication 6, dans lequel la règle de correspondance permettant de mettre en correspondance des points de génération d'estampille temporelle de paquet consiste à :
    considérer le dernier bit du champ délimiteur dans l'en-tête de trame d'une trame TC GTC de la troisième trame sens montant au niveau de la sous-couche de verrouillage des trames GTC comme le point de génération d'estampille temporelle de paquet ; ou
    considérer le dernier bit du champ HEC dans l'en-tête de trame d'une trame GEM de la troisième trame sens montant au niveau de la sous-couche d'adaptation TC comme le point de génération d'estampille temporelle de paquet ; ou
    considérer le dernier bit du champ de surdébit de couche physique sens montant, dit PLOu, dans l'en-tête de trame d'une trame TC GTC de la troisième trame sens montant au niveau de la sous-couche de verrouillage des trames GTC comme le point de génération d'estampille temporelle de paquet.
  8. Procédé selon la revendication 7, dans lequel :
    les premier, deuxième, troisième et quatrième paquets d'horloge sont acheminés dans un mode IEEE 1588/1588v2 sur GEM ;
    les premier, deuxième, troisième et quatrième paquets d'horloge sont acheminés dans des messages d'exploitation, d'administration et de maintenance de couche physique, dites PLOAM ; ou
    les premier, deuxième, troisième et quatrième paquets d'horloge sont acheminés dans des messages d'interface de gestion et de commande d'ONU, dite OMCI.
  9. Dispositif de réseau optique, comprenant :
    une unité d'envoi, configurée pour envoyer un premier paquet d'horloge acheminé dans une première trame sens descendant sur la base d'un protocole de réseau optique passif, dit PON, et un deuxième paquet d'horloge acheminé dans une deuxième trame sens descendant sur la base du protocole PON, le deuxième paquet d'horloge acheminant le temps auquel le premier paquet d'horloge est envoyé ;
    une première unité de surveillance, configurée pour déterminer un point de génération d'estampille temporelle de paquet en fonction de données de trame de la première trame sens descendant au niveau d'une couche de commande d'accès au support, dite MAC, de PON ; le point de génération d'estampille temporelle de paquet se situant au niveau du dernier bit d'un champ de synchronisation physique, dite Psync, dans l'entête de trame d'une trame TC de couche de convergence de transmission de PON gigabit, dite GTC, ou au niveau du dernier bit du champ de contrôle d'erreurs dans l'en-tête, dit HEC, dans l'en-tête de trame d'une trame de méthode d'encapsulation de PON gigabit, dite GEM, de la première trame sens descendant au niveau d'une sous-couche d'adaptation TC ; et
    une première unité d'acquisition, configurée pour acquérir un temps en le point de génération d'estampille temporelle de paquet et considérer le temps acquis comme le temps auquel le premier paquet d'horloge est envoyé.
  10. Dispositif de réseau optique selon la revendication 9, comprenant en outre :
    une unité de réception, configurée pour recevoir un troisième paquet d'horloge acheminé dans une troisième trame sens montant sur la base du protocole PON ;
    une deuxième unité de surveillance, configurée pour déterminer un point de génération d'estampille temporelle de paquet en fonction de données de trame de la troisième trame sens montant au niveau de la couche MAC PON ;
    une deuxième unité d'acquisition, configurée pour acquérir un temps en le point de génération d'estampille temporelle de paquet et considérer le temps acquis comme le temps auquel le troisième paquet d'horloge est reçu ; et
    l'unité d'envoi, configurée en outre pour recevoir un quatrième paquet d'horloge acheminé dans une quatrième trame sens descendant sur la base du protocole PON, le quatrième paquet d'horloge acheminant le temps auquel le troisième paquet d'horloge est reçu.
  11. Dispositif de réseau optique selon la revendication 10, dans lequel la deuxième unité de surveillance est configurée en outre pour :
    considérer le dernier bit du champ délimiteur dans l'en-tête de trame d'une trame TC de couche de convergence de transmission de PON gigabit, dite GTC, de la troisième trame sens montant au niveau d'une sous-couche de verrouillage des trames GTC comme le point de génération d'estampille temporelle de paquet ; ou
    considérer le dernier bit du champ de contrôle d'erreurs dans l'en-tête, dit HEC, dans l'en-tête de trame d'une trame de méthode d'encapsulation de PON gigabit, dite GEM, de la troisième trame sens montant au niveau d'une sous-couche d'adaptation TC comme le point de génération d'estampille temporelle de paquet ; ou
    considérer le dernier bit du champ de surdébit de couche physique sens montant, dit PLOu, dans l'en-tête de trame de la trame TC GTC de la troisième trame sens montant au niveau de la sous-couche de verrouillage des trames GTC comme le point de génération d'estampille temporelle de paquet.
  12. Dispositif de réseau optique, comprenant :
    une unité de réception, configurée pour recevoir un premier paquet d'horloge acheminé dans une première trame sens descendant sur la base d'un protocole de réseau optique passif, dit PON, et un deuxième paquet d'horloge acheminé dans une deuxième trame sens descendant sur la base du protocole PON, le deuxième paquet d'horloge acheminant le temps auquel le premier paquet d'horloge est envoyé ;
    une première unité de surveillance, configurée pour déterminer un point de génération d'estampille temporelle de paquet en fonction de données de trame de la première trame sens descendant au niveau d'une couche de commande d'accès au support, dite MAC, de PON ; le point de génération d'estampille temporelle de paquet se situant au niveau du dernier bit d'un champ de synchronisation physique, dite Psync, dans l'entête de trame d'une trame TC de couche de convergence de transmission de PON gigabit, dite GTC, ou au niveau du dernier bit du champ de contrôle d'erreurs dans l'en-tête, dit HEC, dans l'en-tête de trame d'une trame de méthode d'encapsulation de PON gigabit, dite GEM, de la première trame sens descendant au niveau d'une sous-couche d'adaptation TC ; et
    une première unité d'acquisition, configurée pour acquérir un temps en le point de génération d'estampille temporelle de paquet et déterminer le temps acquis comme le temps auquel le dispositif de réseau optique reçoit le premier paquet d'horloge ; et
    une unité d'ajustement, configurée pour ajuster un temps local en fonction d'une différence entre le temps auquel le premier paquet d'horloge est envoyé et le temps auquel le premier paquet d'horloge est reçu.
  13. Dispositif de réseau optique selon la revendication 12, comprenant en outre :
    une unité d'envoi, configurée pour envoyer un troisième paquet d'horloge acheminé dans une troisième trame sens montant sur la base du protocole PON ;
    une deuxième unité de surveillance, configurée pour déterminer un point de génération d'estampille temporelle de paquet en fonction de données de trame de la troisième trame sens montant au niveau de la couche MAC PON ;
    une deuxième unité d'acquisition, configurée pour acquérir un temps en le point de génération d'estampille temporelle de paquet et considérer le temps acquis comme étant le temps auquel le troisième paquet d'horloge est envoyé ;
    une unité de correction, configurée pour corriger le temps du dispositif de réseau optique en fonction d'une différence entre le temps auquel le troisième paquet d'horloge est envoyé et le temps auquel le troisième paquet d'horloge est reçu ; et
    l'unité d'envoi, configurée en outre pour recevoir un quatrième paquet d'horloge acheminé dans une quatrième trame sens descendant, le quatrième paquet d'horloge acheminant le temps auquel le troisième paquet d'horloge est reçu.
  14. Dispositif de réseau optique selon la revendication 13, dans lequel la deuxième unité de surveillance est configurée en outre pour :
    considérer le dernier bit du champ délimiteur dans l'en-tête de trame d'une trame TC de couche de convergence de transmission de PON gigabit, dite GTC, de la troisième trame sens montant au niveau d'une sous-couche de verrouillage des trames GTC comme le point de génération d'estampille temporelle de paquet ; ou
    considérer le dernier bit du champ de contrôle d'erreurs dans l'en-tête, dit HEC, dans l'en-tête de trame d'une trame de méthode d'encapsulation de PON gigabit, dite GEM, de la troisième trame sens montant au niveau d'une sous-couche d'adaptation TC comme le point de génération d'estampille temporelle de paquet ; ou
    considérer le dernier bit du champ de surdébit de couche physique sens montant, dit PLOu, dans l'en-tête de trame de la trame TC GTC de la troisième trame sens montant au niveau de la sous-couche de verrouillage des trames GTC comme le point de génération d'estampille temporelle de paquet.
  15. Système de communication optique point-multipoint, comprenant une terminaison de ligne optique, dite OLT, et au moins une unité de réseau optique, dite ONU, dans lequel :
    l'OLT comprend :
    un module de traitement de synchronisation d'horloge maîtresse, configuré pour envoyer un premier paquet d'horloge acheminé dans une première trame sens descendant sur la base d'un protocole de réseau optique passif, dit PON, et un deuxième paquet d'horloge acheminé dans une deuxième trame sens descendant sur la base du protocole PON, le deuxième paquet d'horloge acheminant le temps auquel le premier paquet d'horloge est envoyé ; et
    un module de génération d'estampille temporelle de paquet d'horloge maîtresse, configuré pour acquérir un temps en un point de génération d'estampille temporelle de paquet qui correspond à des données de trame de la première trame sens descendant au niveau d'une couche de commande d'accès au support, dite MAC, de PON ; une règle de correspondance permettant de mettre en correspondance le point de génération d'estampille temporelle de paquet étant prédéfinie d'un côté horloge maîtresse ; le point de génération d'estampille temporelle de paquet se situant au niveau du dernier bit d'un champ de synchronisation physique, dite Psync, dans l'en-tête de trame d'une trame TC de couche de convergence de transmission de PON gigabit, dite GTC, ou au niveau du dernier bit du champ de contrôle d'erreurs dans l'en-tête, dit HEC, dans l'entête de trame d'une trame de méthode d'encapsulation de PON gigabit, dite GEM, de la première trame sens descendant au niveau d'une sous-couche d'adaptation TC ; et considérer le temps acquis comme le temps auquel le premier paquet d'horloge est envoyé ;
    l'ONU comprend :
    un module de génération d'estampille temporelle de paquet d'horloge asservie, configuré pour acquérir un temps en un point de génération d'estampille temporelle de paquet qui correspond à des données de trame de la première trame sens descendant au niveau d'une couche de commande d'accès au support, dite MAC, de PON ; une règle de correspondance permettant de mettre en correspondance le point de génération d'estampille temporelle de paquet étant prédéfinie d'un côté horloge asservie ; le point de génération d'estampille temporelle de paquet se situant au niveau du dernier bit du champ de synchronisation physique, dite Psync, dans l'en-tête de trame d'une trame TC de couche de convergence de transmission de PON gigabit, dite GTC, ou au niveau du dernier bit du champ de contrôle d'erreurs dans l'en-tête, dit HEC, dans l'en-tête de trame d'une trame de méthode d'encapsulation de PON gigabit, dite GEM, de la première trame sens descendant au niveau d'une sous-couche d'adaptation TC ; et
    un module de traitement de synchronisation d'horloge asservie, configuré pour recevoir la première trame sens descendant et la deuxième trame sens descendant et ajuster un temps local de l'ONU en fonction d'une différence entre le temps auquel le premier paquet d'horloge est envoyé et le temps auquel le premier paquet d'horloge est reçu.
EP09741699.4A 2008-05-09 2009-04-30 Procédé de synchronisation temporelle d'un système de réseau optique passif, système et dispositif de réseau optique Active EP2271024B1 (fr)

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US8570874B2 (en) 2013-10-29
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US8223648B2 (en) 2012-07-17
US9154861B2 (en) 2015-10-06
EP2271024A4 (fr) 2011-06-29
CN101577600A (zh) 2009-11-11
US20110052206A1 (en) 2011-03-03
US20140023369A1 (en) 2014-01-23
CN101577600B (zh) 2013-04-24
US20120027405A1 (en) 2012-02-02

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